This might seem familiar to many of the veterans here, but since it has not been exclusively asked, I am posting it.
A 13-foot tall truck is at the entrance of a tunnel with a clearance of 12 feet 11 inches.
What is the most economic and simplest solution possible that the driver of the truck has at hand to pass through the tunnel safely to arrive the other side with the truck?
N.B. As the problem implies there are multiple solutions possible. I am expecting a specific answer which on consensus of the reader(s) can be regarded as the acceptable answer.
Disclaimer: I did not create this puzzle but heard it way back in the 80's as a young kid. I think it is a Edward De Bono puzzle.
Anyways the alternate answers are rarely documented which is what I am after. Investing further time to curate through the list of answers is no longer possible and am accepting the classical answer.